My foot is 28 centimeters long. how long is this in meters

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

What is the mass of phosphorous in a 51-kg person